Gas-lamp.



PATENTED AUG; 18, 1903.

T. BRABSON.

GAS LAMP. APPLICATION P111111) 0M. 10, 1902.

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No. 736,681. PATENTED AUG. 18, 1903-.

T. BRABSON.

' GAS LAMP. APPLICATION FILED our. 10, 1902. no MODEL. 2 SHEETS-SHEET 2.

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NlTE STATES ATENT OFFICE.

TOM BRABSON, or BROOKLYN, NEW YORK, AssIeuOR TO FULTON BRASS &;MANUFACTURING COMPANY, OF BROOKLYN, NEW YORK, A OORPORA TIONOF NEW YORK.

GAS-LAMP.

SPECIFICATION forming part of Letters Patent N 0. 736,681, dated August18 1963'. Application filed October 10, 1902. Serial No. 126,655. (Nomodel.)

T (ZZZ whom it II 00771067771! little useful effect and tofurtherincrease the Be it known that I, TOM BRABSON, a citizen uglinessof the whole. of the United States, residing in the borough According tomy invention I provide above of Brooklyn, county of Kings, city andState the usual globe a simple cylindrical screen, 5 5 of New York, haveinvented certain new and preferably of a diameter at least as great asusefullmprovementsin Gas-Lamps, of which that of the opening in the topof the globe the following is a specification. and of a heightsufficient to form a suitable My invention aims to provide certainimdraft, the column of air moving directly up= provements inincandescent gas-lamps, and ward without substantial obstruction in the1o especiallyin cluster-lamps-such as are comcylindrical screen. Thisscreen also furmonly used for lighting stores, large halls, or nishesquite sufficient protectionagainstcrossthe like-whereby the constructionof a com drafts, at least for indoor use or for use in plete lamp ismade very simple and cheap, any comparatively sheltered place. Thewhereby a better draft and a whiter light screen is preferablyperforated to admit the I5 are secured than in such lamps as nowcomoutside air directly to the column of hot air monly constructed,whereby ample protecto gradually cool the rising column and to tion isafforded against insects and against supply oxygen for the consumptionof the cross-drafts withoutsubstantiallyobstructing carbon of the gas,which consumption conthe passage of the hot gases of combustion, tinuesfor some distance above the lamp. 7o 20 and whereby especially theentire lamp is This reduces the amount of smoke issuing given a mostgraceful and pleasing appearfrom the lamp. By reason of the perforaancewithout sacrificing its lighting qualities. tions in the screen I amalso enabled to place My invention also provides certain imthe shade orbell which comes above the same provements in the controlling-valve ofsuch a quite low down toward the upper edge of the 25 lamp, whereby asingle tap is used for cutting screen. The shade referred to is placed2. off any desired number of individual burners. short distance abovethe screen,sufficient only My invention also provides certain imtopermit free egress of the rising column of provements in individualincandescent burnair within the screen, and serves not only to ers andin other details, as hereinafter speciprevent discoloration of theceiling by the 3o fled. rising column of slightly smoky air, but alsoReferring to the accompanying drawings, acts to reflect downwardsubstantially all the illustrating a lamp embodying my invention, lightthrown upward by the burner-a feature Figure 1 is a side elevation ofthe complete which is generally lacking in lamps at preslamp. Fig. 2 isa longitudinal section of the out in use. The globe may be of anysuitable 35 same, showing the burner and supply-pipe in 1light-transmitting material, such as glass or elevation. Fig. 3 isalongitudinal section of porcelain. The screen is preferably of sheetthe burner and controlling-valve. Fig. 4. is a metal. The shade is ofsuitable light-reflectside elevation of the complete burner, showingmaterial of which ordinary lamp-shades ing certain parts in section. aremade. 0 40 In cluster gas-lamps as commonly con- An important featureinmyimprovcd lamp structed the most ugly and complicated conis a serialcut-out valve--that is to say, a

structions are in use for disposing of the hot valve which cuts off gasin succession from air discharged from the lamp without exposthe severalbranches leading from the main ing the lamp to the danger of beingchoked supply-pipe as the valve is moved coutinn- 45 by insects flyingthereinto and of being ously in one direction. The burner is prefcausedto fluctuate by reason of drafts of air erably formed also with adirt-receptacle beblowing across the top of the globe, which low thevalve for preventing the same or any devices usually interfere'with theprovision other parts of the burner from becoming of a suitable shadefor reflecting the light clogged with the dirt which is collected from50 downward, so that the latter is omitted enthe passing current of gas.

tirely or is arranged in a manner to have but Another novel feature ofthe invention is and adapted to inclose the lower edge of themantle.

Referring now to the embodiment illustrated in the accompanyingdrawings, A is a main supply-pipe leading down to and sup- 'porting acluster B, consisting of four individual burners. The burners arelocated substantially in the center of aglobe O, of glass,

material, such as glazed ware.

and shade are preferably supported from the porcelain, or the like,which is of such size as to provide ample space for the passage of thenecessary quantity of air therethrough. Surrounding the upper opening Dof the globe is a cylindrical screen E, of metal, perforated in anysuitable ornamental pattern, as shown, and extending upward a distancedepending upon the size of the burner and the pressure of gas used.Atasuitable distance above the screen E to permit the easy discharge ofthe hot air arising through the screen is a shade F, preferably of anysuitable light-reflecting The screen main supply-pipe A, the former byresting directly on the globe O and the latter by means of a collar G,secured directly on the pipe. In order to steady the screen E and tosupport the same when the globe is withdrawn, there is preferablyanother collar H on the pipe, which may be, as shown, a union connectingtwo separate sections of the pipe and which is situated a short distancebelow the normal position of a hub J, sliding on the pipe, and havingtwo or more arms connected at their outer ends to the screen E. In orderto simplify the manufacture of the screen and to make a more ornamentalscreen Without excessive cost, it is preferably formed in three parts-acentral body E of truly cylindrical shape, as described, and upper andlower flaring portions E joined to the ends of the body portion E andformed in any desired ornamental design. The globe may be supported inany desired manner, being shown as supported at its bottom edge by armsK, projecting outward from the burner, and between which' there is spacefor the admission of ample air. The lower portion of the burnerpreferably extends below the globe and is surrounded by an ornamentalcap L of any suitable design. I

M is a cock controlling the supply of gas to the burner and preferablyextends downward through the center of the cap, completing thesymmetrical proportions of the whole lamp.

The shade F is preferably adjustable, the collar G being secured at anydesired point on the supply-pipe by means of a set-screw, as shown. Byreason of this construction the outlet for the hot gases between thescreen and the shade may be made larger or smaller, as desired, or theposition of the shade to distribute the light reflected from it may bevaried.

In lamps for indoor use it is desirable to make as short a lamp aspossible, because the head-room available is sometimes very little. Myimproved lamp by reason of the perforated screen employed may extendonly a short distance above the top of the burner, and the shade F notonly prevents discoloration ofthe ceiling by the hot air rising, butacts to reflect the light thrown directly upward and which is lost incluster-lamps of ordinary construction. A perfect draft is obtained, soas to avoid smoke and to secure a white light. The main supply-pipe,being inclosed and subjected to the heat from the burner, suppliespartiallyheated gas to the burner,which improves the light. Theperforated screen is ample protection against cross-drafts and againstinsects flying into the lamp in the majority of situations. The screenmay fit down closely upon the globe, so as to prevent ingress of anysubstantial quantity of air at this point, which air would cause thelight to fluctuate. The assembled lamp is made of most graceful andpleasing shape without any sacrifice of utility.

I also provide an improvement which makes .it possible to reduce thenumber of individual burners in use, so that, for example, at night avery low light can be maintained, and I do this without the addition ofany mechanism other than that usually found in lamps in which all theburners must be in use. For this purpose the main supply-pipe isprovided with a plurality of branches to the individual burners, and asingle valve is arranged to cut off gas from said branches'in successionas it is moved continuously in one direction. As indicated in Figs. 3and 4., the supply-pipe A carries at its lower end a member N, in whichis formed a diaphragm 0, serving as a main valve-seat and which has aseries of apertures at different sides and at different elevations, towhich are connected the several branches P P,- &c., each of whichbranches supplies gas to one of the individual burners. Sliding withinthemember N is a valve comprising a plunger Q, having a long stem R,provided with a rapid screw-thread S at an intermediate portion and witha handwheel or the like at its lower end, as indicated. The passage inthe member N is open at its lower end and leads into a dirt-receptacleT, attached to the lower end of 'the member N, in which the dirt whichcomes down the main pipe in the gas is collected,

the lower portion of the bore of the valve member N being made largerthan the plunger Q to permit the collection of this dirt when the valveis entirely open, as in ordinary use. The lower portion of thedirt-receptacle E is formed into a long stem interiorly screw-threadedto correspond with the threads S, and preferably a stuffing-box U isprovided upon the lower end of such stem. The valve is easilyaccessible, it being only necessary to remove the dirt-receptacle T,which carries with it the valve and valvestem. The dirt within thereceptacle may then be removed and the parts quickly restored to theiroperative position. When the dirt-receptacle and the connected parts areremoved, the various passages adjacent to the valve may be easilyinspected.

The improvement in individual burners is best illustrated in Fig. 4,where it is shown applied to the tubes of myimproved clusterbnrner. Itmay, however, obviously be applied to incandescent gasburners of anyother suitable type. In the embodiment shown the Bunsen tubes V aresupplied with gas from the several branches P P, (be. from the mainsupply-pipe A, and the mantles W are supported from any suitableholdersuch, for example, as the overhead holder X. The lower edge of themantle surrounds the upper end of the tube, as usual. It is found inactual experience that the space which is necessarily left between thelower edge of the mantle and the outer periphery of the tube in order topermit the placing of the mantle over the end of the tube admits aconsiderable quantity of air, which dulls the light and sometimes causesa vibration or fluttering of the mantle. My invention provides means forclosing said space, so as to prevent the admission of air at this pointwithin the mantle. The means which I employ for this purpose form,preferably, part ofa cap Y, placed over the upper end of the tube andpreferably acting to hold the usual wire-netting Z in place on the tube,this cap, as shown, preferably inclosing the lower edge of the mantle bymeans of an upwardly-bent outer edge a, which is preferably made flaringto receive mantles of varying diameters and which preferably extendssubstantially to the level of the top of the tube, so that the mantlemay shrink (as it usually does) without freeing itself from the cap. Thecap should preferably stop at the level stated in order to avoidobscuring the light from the mantle. By the use of myimproved cap thelight is not interfered with, but is in many cases improved inbrightness and steadiness, and also the necessity of fitting the mantleaccurately to the head of the tube is avoided.

Though I have described with great particularity of detail a lampembodying myinvention, it will be understood that the invention is notlimited to the particular embodiment illustrated and described. Variousmodifications of the same are possible to those skilled in the artwithout departure from the invention.

What I claim is- 1. In a gas-lamp the combination ofa globe, acylindrical screen above and supported directly upon said globe, aburner within said globe, and a supply-pipe extending through saidscreen and supporting said burner, globe and screen, said screen havinga diameter and a clear passage equal at least to that of the opening inthe top of said globe, and being perforated to admit air from outsidedirectly to the column of hot air ascending from said burner within saidscreen.

2. In a gas-lamp the combination of a globe, a cylindrical screen aboveand supported directly upon said globe, a burner within said globe, asupply-pipe extending through said screen and supporting said burner,globe and screen, said screen having a diameter and a clear passageequal at least to that of the opening in the top of said globe, andbeing perforated to admit air from outside directly to the column of hotair ascending from said burner within said screen, and a shade abovesaid screen having its lower edge above the upper edge of said screen topermit free egress of the rising column of air therein.

3; In a gas-lamp the combination of a globe of light-transmittingmaterial, an open cylindrical screen of metal above said globe, a burnerwithin said globe, and a shade of lightreflecting material above saidscreen arranged to reflect downward and outside of said screen the lightpassing therethrough.

4. In a gas-lamp the combination of aglobe, a cylindrical screen abovesaid globe, a burner within said globe, and a supply-pipe extendingthrough said screen and supporting said burner and globe, said screenbeing supported directly upon said globe.

5. In a burner for cluster gas-lamps, the combination of a mainsupply-pipe, a plurality of branches connected therefrom atlongitudinally-separated points, and a valve comprising a plunger insaid pipe and adapted to cut off gas from said branches in succession asit is moved continuouslyin one direction.

6. In a burner for cluster gas-lamps, the combination of a mainsupply-pipe, a plurality of branches connected therefrom atlongitudinally-separated points, a valve comprising a plunger in saidpipe and adapted to cut off gas from said branches in succession as itis moved continuouslyin one direction, and a valve-seat in said pipeagainst which said valve closes after cutting off all said branches.

'7. In a burner for cluster gas-lamps, the combination of a mainsupply-pipe, a member connected thereto and carrying a valveseat, adirt-receptacle below said member and a valve arranged to reciprocate insaid memher, said member having a bore opening at its lower end intosaid dirt-receptacle.

In Witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

TOM BRABSON. \Vitnesses:

THOMAS F. WALLACE, FRED WHITE.

